Question: What NFPA-listed chemical compound has the most potential to contribute to global warming?
Paraphrase: Tell me what NFPA-listed chemical compound has the most potential to contribute to global warming
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11173 . ?ent wdt:P2565 ?obj . ?ent wdt:P4952 wd:Q51139288 } ORDER BY DESC(?obj)LIMIT 5 
Answer: sulfur hexafluoride, sulfur hexafluoride, sulfur hexafluoride, nitrogen trifluoride, sulfur hexafluoride